v0.1.0 - Encryption in place

See #8 for specifics.

You can now do envelope encrypt --key some.key --in-place config.yaml to encrypt values directly in documents. 🎉

Breaking changes

• --key has been renamed to --profile
• add-key command moved to profile add in preparation for other profile related commands
• --key on encrypt now refers to the the path to a key in a structured input
• encrypt with blob format no longer prefixes the output unless --with-prefix is supplied